<?php


$leetCode = [    
'a' => '4',
'b' => 'I3',
'c' => '[',
'd' => ')',
'e' => '3',
'f'  => '|=',
'g' => '&',
'h' => '#',
'i' => '1',
'j' => ',_|',
'k' => '>|',
'l' => '1',
'm' => '/\\/\\',
'n' => '^/',
'o' => '0',
'p' => '|*',
'q' => '(_,)',
'r'=> 'I2',
's' => '5',
't' => '7',
'u' => '(_)',
'v' => '\/',
'w' => '\/\/',
'x' => '><',
'y' => 'j',
'z' => '2',
'1' => 'L',
'2' => 'R',
'3' => 'E',
'4' => 'A',
'5' => 'S',
'6' => 'b',
'7' => 'T',
'8' => 'B',
'9' => 'g',
'0' => 'o'  
];


function toLeet(string $text = ""){
    global $leetCode;
    if (empty($text)){
        return 'Please write a text';
    }
    return strtr($text,$leetCode);    
}

echo toLeet("Hola mundo, soy yo Carlos. ")

?>
